This topic is quit the controversy. I have a 03 4.0 4x4, and a 06 4.6 4x4. Both geared 355. You will never get the torque out of the 4.0 that you will with the 4.6, and torque is what you need for big tires as well as that low end grunt you will want in the mud or snow. But as blue_goose stated...